EP 1012375 A1 20000628 - PROCESS AND APPARATUS FOR TREATMENT OF FIBROUS RAW MATERIAL
Title (en)
PROCESS AND APPARATUS FOR TREATMENT OF FIBROUS RAW MATERIAL
Title (de)
VERFAHREN UND VORRICHTUNG ZUR BEHANDLUNG VON FASERIGEN ROHSTOFFEN
Title (fr)
PROCEDE ET APPAREIL POUR TRAITER UN MATERIAU BRUT FIBREUX
Publication
Application
Priority
- FI 9700054 W 19970131
- FI 960456 A 19960131
Abstract (en)
[origin: WO9728305A1] The invention relates to a process and apparatus for pretreating pulp raw material, to be subsequently prepared in a chemical pulping process, and for preparing cellulose pulp from a fibrous starting material. According to the process the starting material is delignified to yield a chemical cellulose pulp, and the obtained pulp is bleached when desirable. According to the invention the starting material is crushed in cooking liquor prior to delignification in order to open its fiber structure. The apparatus of the invention comprises a frame (21), to which two adjacent first rolls (12; 22, 23) have been fitted, which form a first pair of rolls with the rolls arranged to distance from each other in such a manner that a gap clearance is formed between their outer mantles. The rolls are caused to rotate by a means of power transmission, which causes the raw material to be crushed inside the gap between the rolls where a liquid pocket is formed, from which liquid is absorbed into the fiber material being treated. The invention provides even cooking of the raw material under mild conditions.
IPC 1-7
IPC 8 full level
D21B 1/02 (2006.01); D21C 1/10 (2006.01); D21C 3/00 (2006.01)
CPC (source: EP US)
Citation (search report)
See references of WO 9728305A1
Designated contracting state (EPC)
DE ES FI FR SE
DOCDB simple family (publication)
WO 9728305 A1 19970807; AU 1603397 A 19970822; CA 2244933 A1 19970807; CZ 219098 A3 19990217; CZ 293998 B6 20040915; EP 1012375 A1 20000628; FI 103418 B1 19990630; FI 103418 B 19990630; FI 960456 A0 19960131; FI 960456 A 19970801; JP 2000504072 A 20000404; US 6214164 B1 20010410
DOCDB simple family (application)
FI 9700054 W 19970131; AU 1603397 A 19970131; CA 2244933 A 19970131; CZ 219098 A 19970131; EP 97902369 A 19970131; FI 960456 A 19960131; JP 52733597 A 19970131; US 11716298 A 19980807